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ID:33528777
大小:69.90 KB
页数:14页
时间:2019-02-26
《不同物性储层砂岩出砂力学响应研究》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
1、不同物性储层砂岩出砂力学响应研究摘要:储层砂岩是由砂岩颗粒胶结而成的沉积岩,同一区域的物性特征不尽相同,油藏开采时的地层响应和出砂也会有差异。以2种不同的储层砂岩为研究对象,基于柱坐标系的三维颗粒流数值模型,模拟射孔围压和油藏流速一定时的砂岩宏细观力学响应,分析出砂的发生和发展过程。砂岩的宏观应力曲线表明砂岩颗粒间的弱胶结性越弱,胶结物质含量越少,砂岩越容易屈服破坏,出砂越容易。砂岩的黏结应力分布同样说明储层的砂岩颗粒越小、胶结含量和胶结程度越小,离散的颗粒越多,颗粒接触上的受力越大,砂岩破坏越严重,出砂的几率越大;同时,颗粒的位移和旋转也说明胶结物质对储层砂岩力学特性和出砂
2、的影响较大,与上述研究成果一致。储层开采中,不同物性的储层砂岩力学响应不同,出砂特性有差异,需要针对实际的储层物性和赋存环境,采用适宜的出砂预测方法和防砂手段。关键词:储层砂岩;出砂;三维颗粒流程序;力学响应;不同物性中图分类号:TU45文献标志码:A文章编号:16744764(2014)02002807Abstract:Thereservoirsandstoneisthesedimentaryrockwithmanycementedsandparticles・Thedifferentphysicalpropertyofthereservoireveninthesameare
3、aresultsindifferentmechanicalresponseandsandproductionofthesandstone・Takingtwotypesofthereservoirsandstonesasresearchsubjects,anumericalmodelbasedon3DimensionalPartidebasedDistinctElement(PFC3D)undercylindricalcoordina.tesystemwasusedtoSimulatethemicromicroresponseofthesandstoneconsideringt
4、hegivenconfiningpressureandtheoilflowrate.Meanwhile,thesandinginitiationandtheprocessofthedevelopmentwereanalyzed.Themacrostressindicatedthatthereservoirsandstoneswithweakercementedsandparticlesandlesspercentofthecementedmaterialswouldyieldandfailmoreeasily,thesandproductionwasinitiatedmore
5、easilyaswelLMeanwhile,thestressoftheparallelbondsindicatedthatthereservoirsandstoneswithgranuleandlesscementedmaterialsdislodgedfromthesandstonemoreeasily,andtheforceontheparticlecontactwaslargerandthesandstonefailurewasmoreserious.Hence,theprobabilityofthedislodgedparticlesflowingintothewe
6、llborewasalsomuchmore・Inaddition,theparticledisplacementandrotationindicatedthatthephysicalpropertyofthesandstoneplayedasignificantinfluenceonthemechanicalresponseandthesandproduction,theresultsalsoagreedwiththeaboveresuIts.Therefore,thesandmechanicalresponseandsandproductionofreservoirsand
7、stonearebothdifferentduetodifferentphysicalpropertyofthereservoir.Asaresult,thereliablemeasuresofthesandpredictionandsandcontrolwillbeadoptedbasedonthereservoirphysicalpropertyandconditions・Keywords:reservoirsandstone;sandproduction;3Dimensionalpartideba
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